

public class demo4 {
    static int count;
    public static void main(String[] args) throws InterruptedException {
        Object locker=new Object();
        Thread t1=new Thread(()->{
            synchronized(locker){
                synchronized(locker){
                    for(int i=0;i<5000;i++){
                        count++;
                    }
                    System.out.println("线程t1结束");
                }
            }
        });
        Thread t2=new Thread(()->{
            synchronized (locker){
                synchronized (locker){
                    for(int i=0;i<5000;i++){
                        count++;
                    }
                    System.out.println("线程t2结束");
                }
            }
        });
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("count="+count);
    }
}
